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Have you tried repairing the file system? Find out the file system type and then do check the appropriate man pages to check how to repair. Then try to mount it again. If it doesn't work I'm afraid you'll need a recovery tool.

hard disk recovery using USB drive box

Hi

It is Logical Volume I think that Logical Volume manager use xt3 below.
It is a competitor of reiserfs and Jfs (Aix Logical volum manager).
I think that it is redhat specific and that it use at lower level ext3.
Below the HOWTO answer to the question :
What is Logical Volume management.

Logical volume management provides a higher-level view of the disk storage on a computer system than the traditional view of disks and partitions. This gives the system administrator much more flexibility in allocating storage to applications and users.

Storage volumes created under the control of the logical volume manager can be resized and moved around almost at will, although this may need some upgrading of file system tools.

The logical volume manager also allows management of storage volumes in user-defined groups, allowing the system administrator to deal with sensibly named volume groups such as "development" and "sales" rather than physical disk names such as "sda" and "sdb".

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Boot partition which is ext3 is readable etc.
When I start Logical Management tool in fedora it sees sda2 (the ext3 partition) but not sda3 (the LVM partition)
Only fdisk succeed to see and identify sda3.

Ext3 is not redhat specific. It would be a shame for a Linux distro to use a proprietary file system. All above file systems are available for every linux distribution (although you need the right kernel to support them). Try the commands I gave you above.